Poolmaster 13058 Replacement Filter Cartridge for CFT-100 42-2941-08-R Filter Equivalent to the following replacement filter cartridges; Pleatco PJ100-4 and Unicel C-9699 The top of the replacement filter cartridge is open 5-13/16 soft and the bottom is open 6-1/16 soft Break-resistant bands keep pleats separated for greater flow, filtration and add longer life to cartridge High quality spun bonded polyester material for exceptional water filtration Premium grade polyurethane and plastisol end caps